Non-invasive magnetometry and quantum sensing at the atomic-scale

Datum

31.01.2025

Zeit

09:00 - 10:00

Sprecher

Prof. Dr. Aparajita Singha

Zugehörigkeit

TU Dresden

Sprache

en

Hauptthema

Materialien

Host

Martina Javorka

Beschreibung

Controlling individual atoms and molecules at their native spatio-temporal limit has an indispensable appeal that has driven fundamental research for decades leading to technological leaps ranging from nanoelectronics to information processing. Recently, a new avenue has emerged for nanoscale quantum bits made of individual surface-supported lanthanide atoms and molecules. The large magnetic moments, strong intra- as well as interatomic electron correlations, and long-term quantum coherence in these systems altogether offer a myriad of new exciting possibilities across molecular magnetism and quantum computing research. My group is devoted to manoeuvre quantum properties of such smallest building blocks of matter, especially by probing them in the least invasive manner. However, addressing their individual spin state is a daunting task. So far, only scanning tunneling microscopy (STM) with subatomic spatial resolution is capable of achieving this, albeit being highly invasive and limited with the scope of operational temperature (< 4 K). Atomic force microscopy (AFM) with novel colour center probes (NV) has the potential to overcome these, given their unparalleled magnetic sensing capability, high-fidelity optical readout, and broad operational range of temperature. However, this currently suffers from insufficient resolution (tens of nm) mainly due to fluorescence quenching in so-called shallow NVs. By combining controlled surface-chemistry with AFM-based manipulation techniques, our major focus is to create an advanced non-invasive NV-magnetometry tool with strongly improved spatial resolution. On one hand, this will allow us to gain novel insights into atomic-scale magnetic structures, their interactions, and dynamics. On the other hand, this will further unlock exciting new prospects for magnetic imaging on the scale of a few nm. For instance, besides providing basic components for a new hybrid quantum-information processing platform, transport measurement capabilities at the atomic-scale, exploration of collective spin physics in modern 1D and 2D systems (including novel van der Waals materials), and investigation of complex physical/chemical and even biological reactions with true single spin sensitivity will become reachable. After presenting a broad overview of our research in recent years, I will highlight the bright future ahead for nanoscale non-invasive NV-magnetometry.

Links

• Seminars at the IFW

Letztmalig verändert: 31.01.2025, 07:37:23